Experimental Validation on Sensitivity of Squint Angle and Coherence of Linear Phase Error for One Echo-Driven MOCO Method

Airborne terahertz video synthetic aperture radar (THz-ViSAR) exhibits excellent superiorities in the dynamic situation awareness and moving targets detection. Recently, we published an echo-driven motion compensation (MOCO) method suited for THz-ViSAR and obtained satisfactory experimental results. However, the discussion of the sensitivity of the squint angle and the coherence of the linear phase error for the proposed MOCO method still lacks the experimental support. This paper discusses the aforementioned two issues. Firstly, the proposed MOCO method is briefly reviewed. Then, experiments of linear spotlight ViSAR are performed to approximate the case of different squint angles, and the corresponding analysis is given. Finally, taking multiple corner reflectors as the object, imaging results under two adjacent frames before and after the compensation of linear phase errors are tested to explore the effect of the coherence. These two complementary experiments further demonstrate the effectiveness of the proposed echo-driven method.